Pampas Grass is a fast growing plant that can go from a gallon
size to 8 feet in one season. When it gets established Pampas Grass
can reach up to 20 feet in height. Each plant is a fountain of
saw-toothed, grassy leaves above which, in late summer, grow long
stalks that have plumes from 1-3 feet, and bear colors of white,
chamios, or pink. Also this plant is native to Argentina but now
resides in the California region. It particularly likes to be near
water.

Why Pampas Grass is Undesirable:

Pampas Grass is known for its ability to let the seeds of the
plant fly in the wind and grow where ever it lands. Because of this,
the plant is capable of growing everywhere and crowding out the
native plants. The seeds fly to good soil then germinate, and because
of there rapid growth they quickly overpower the existing plant-life,
thereby deleting all of the plants that are slower growing. It
unfortunately is a popular ornamental plant, but it should not be
planted anywhere near wild areas because it reduces the nutrients
available for native plants.